Improvement in combined furnace and steam-generators



Witnesses ITW emol "FRANZ MORTE, or Avisiteur,AUSTRIAI Letters Patent No. 93,46@ dated August 10, 1869.

IMPROVEMENT IN COMINED TURN-ACE AND STEAM-GENERATORS.

The Schedule referred to ill-these Letters Patent and making part of the same.

To all whom, c't may concern:

Be it knownthat I, FRANZ'MRTH, of Vienna, in

tion and operation of the same, reference being had tothe annexed drawings, makig part of this specilication.

rIhe arrangement of the boilers, according to part of these improvements, is shown in Figures l and 2 and somewhat modified in Figures 3 and 4.

The construction consists of one main boiler, acting as steam-producer, and two minor boilers, of which the one acts as feed-boiler, the other as steam-collector.

The steam-producing boiler is placed between the other two, mostly smaller boilers, of which the upper one, serving as steam-collector, can also, from the'way it is built in, serve for super-heating the steam.

The other second minor boiler, vfixed below the main boiler, serves as a feed-boiler, in which, from the way it is built into the' furnace, the water may be preparatorily heated. l

In the accompanying drawings- The main boiler is indicated by .the letter a, the feed-boiler by the letter b, and the steam-collector by the letter c. lhe feed-boiler and the steam-collector are joined to the main boiler by means of tubes,- which are, preferably, ofthe saine diameter as the minor boilers.

The feed-boiler is fed with water, by preference, from its front end, while the man-hole, lfor cleaning the saine, is conveniently situated at its back end.

Ihis system of boilersl has the advantage of holding a larger quantity of water and steam than any of the old systems.

Another advantage is, that almost the entire surface of the boilers is exposed to the heat, and in consequence of this more hequalized exposure, the durability of the boilers is increased.

A further advantage is, that from the much largerI steam-room, in which the steam can he superheated, y

or at least kept at its normal pressure, a suddenly-increased consumption of steam will not necessitate so much subsequent stoking as would otherwise be 'required,

Another fact worth notice is, that on account of the large stea1n-room in this boiler-construction, one of the chief causes of explosion is obviated; that is to say, if we accept that theory of explosions -as correct, ac'- cording to which an explosion may Olten be referred to the fact of the water gathering, during interrupted working, an increased amount of superfluous heat, and

the steam becoming simultaneously cooled down and i condensed, whereupon any attempt to let oii steam gives a sudden shock to the entire mass of water, and causes the sudden evolution of a vast amount of steam.

In building the boiler-furnace, I make ita principle to expose the boiler as much as possible to the flame of the iire, which is of the greatest advantage to a large production of steam.

On this account thel boiler is provided with as few ues lrs-possible, and the arrangement of these lues or smoke-channels varies, of course, according to the construction of V the boilers, as my construction of furnace may be applied to various kinds of boilers.

Thus, for instance, steam-boilers with one or two Y fiues, and with external ring, were always so arranged that the heat streamed backward along the under side of the boiler, then forward through one or two lines, and, nally, parting to the right andleft, owed back again along the sides of the boiler, through the sidechannels, into the chimney, by which arrangement much heat was lost, especially by long boilers.

Now, according to my principle of firing, illustrated in the accompanying drawings, a steam-boiler of Ithis descriptionwould have a much larger surface exposed to the flame and greatest heat of the fire, that is to Y say, not only the bottom of the boiler, but also the sides, which in the other construction would have partly only received the heat of the smoke-channels, and partly covered by the brick-work forming the same. The waste heat would then, further, after passing;` through one or both lues, have been allowed to escape into the chimney, without' passing again along the sides of 'the boile Another part of my improvements consists in thev such away that a separate space, free from draught, .is formed, to which the heated gases have access, but

which does not form a passage for the same. In some cases I iind it advantageous to employ a kind of partition, formed of' lire-brick, dividing the Vfire-hearth into two equal parts, each of which will then have to be supplied with fuel through a separate door.

This partition, which I term fire-tongue, is shown in Figures 5 and 6, and indicated by the letter f. It

slopes downward and jbackward, so as to allow the flame froin one of the two hearth-departments to stream over toward the other, and so cover the entire breadth of the boiler.

The object of this fire-tongue7 is to enable the onehalf of the grate to be cleaned or stoked, without seriously disturbing thc firing ot' the boiler, as in that case the fire on the other grate may continue in full combustion, the llame passing over the fire-tongue, along the entire breadth of the boiler.

Thus, where a number of boilers is in use, the one half of the grates may be supplied in sequence with fuel, and then, when this is in full combustion, the other half of the grates may be stoked, one after the other.

1n order to enlighten the passing of the flames from the gratcs along the boiler, I prefer to make the lirebridge horizontal, (instead of bein g parallel to the curve of the boiler,) and inclined toward the grate.

This construction of lire-bridge also often enables the back partei the space between the boilers to be easier cleaned. Fig'. 5 shows a fire-bridge of this description.

Figures 7 and 8 illustrate the alteration of an ordinary boiler-furnace into one according to my invention. Fig. 7 represents a boiler-furnace according to the old system, with the side-channels s s and partition-walls tt. The lire-bridge u is also curved parallel to the boilerbottom. Fig. 8 shows the furnace altered according to my improvements, the partition-walls t t being removed, and thc fire-bridge u made horizontal, so as to expose almost the entire surface of the boiler, below the water-level, to the action of the flame.

Figure 9 is a side view, and Figure l0 a horizontal section of the fire-tongue described above, and shown, together with a part of the boiler and furnace, in figs. 5 and 6.

Having thus fully described the nature of my improvements,1 will now proceedto specify my exact claims.

I claiml. The combination and arrangement of the boilers a b c with eacli other and with the furnace thereof', substantially as herein set forth.

2. The arrangement of the hot-air space or chamber erence to each other and the hot-water boiler b, when Vconstructed substantially as herein described.

' F. MRTH.

Witnesses:

C. O. PAGET, WM. HMING.

with the upper surface of thc boilers aand c, with rei- 

